spinner help

[Woodard2589]

I'm new to most of this and I'm trying to figure out how to have my app react to a spinner selection. I've seen tutorials using setOnItemSelectedListener but i get errors with it.

Heres my code:

hellospinner.java

package com.shanewoodard.hellospinner;

import android.app.Activity;
import android.os.Bundle;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.AdapterView.OnItemSelectedListener;

public class HelloSpinner extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

Spinner hubSpinner = (Spinner) findViewById(R.id.myspinner);

ArrayAdapter adapter = ArrayAdapter.createFromResource( this, R.array.colors , android.R.layout.simple_spinner_item); adapter.setDropDownViewResource(android.R.layout.s imple_spinner_dropdown_item);

hubSpinner.setAdapter(adapter);


}


}

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
androidrientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello"
/>
<Spinner
android:id="@+id/myspinner"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:drawSelectorOnTop="true"
/>

</LinearLayout>

arrays.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
<string-array name="colors">
<item>Red</item>
<item>Blue</item>
<item>White</item>
<item>Yellow</item>
<item>Black</item>
<item>Green</item>
<item>Purple</item>
<item>Orange</item>
<item>Grey</item>
</string-array>
</resources>

And this is the code i tried using:

Spinner s = (Spinner) findViewById(R.id.myspinner);
s.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener(){

@Override
public void onItemSelected(AdapterView adapter, View v, int i, long lng) {
//do something here
}

@Override
public void onNothingSelected(AdapterView arg0) {
//do something else
}
});

can someone give me the exact code i need? if i don't see the code i can't quite figure it out yet, i'm better at reverse engineering it you could say.

[iPirate]

what is the error? maybe a line #?

[Woodard2589]

I get 3 errors when i add that code. Here they are:

The method onItemSelected(AdapterView, View, int, long) of type new AdapterView.OnItemSelectedListener(){} must override or implement a supertype method


The type new AdapterView.OnItemSelectedListener(){} must implement the inherited abstract method AdapterView.OnItemSelectedListener.onItemSelected( AdapterView<?>, View, int, long)


View cannot be resolved to a type

I've tried using Quick Fix to solve them, but it can't.

[SixStringTheory]

You want to make a new class to handle selection events that implements OnItemSelectedListener like this

public class MyOnItemSelectedListener implements OnItemSelectedListener {

    public void onItemSelected(AdapterView<?> parent, view, int pos, long id) {
      // Do something cool!
    }

    public void onNothingSelected(AdapterView<?> parent) {
      // Do nothing.
    }
}

and then add the listener to your spinner back in onCreate()

spinner.setOnItemSelectedListener(new MyOnItemSelectedListener());

That will probably clear up all three errors

[Woodard2589]

ok, this is what i have now:

package com.shanewoodard.hellospinner;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.AdapterView.OnItemSelectedListener;

public class HelloSpinner extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

Spinner hubSpinner = (Spinner) findViewById(R.id.myspinner);

ArrayAdapter adapter = ArrayAdapter.createFromResource( this, R.array.colors ,
android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.s imple_spinner_dropdown_item);

Spinner.setOnItemSelectedListener(new MyOnItemSelectedListener());


hubSpinner.setAdapter(adapter);
}

public class MyOnItemSelectedListener implements OnItemSelectedListener {

public void onItemSelected(AdapterView<?> parent, View v, int pos, long id) {
// Do something cool!
}

public void onNothingSelected(AdapterView<?> parent) {
// Do nothing.
}
}


}

and it tells me

Cannot make a static reference to the non-static method setOnItemSelectedListener(AdapterView.OnItemSelect edListener) from the type AdapterView<SpinnerAdapter>

[SixStringTheory]

Spinner.setOnItemSelectedListener(new MyOnItemSelectedListener());

should be "hubspinner.setOnItem............."

and I don't know if it's just copy/paste translation adding spaces buy there's a space after the "s" in simple_spinner_dropdown_item. Make sure that's not there in code

adapter.setDropDownViewResource(android.R.layout.s imple_spinner_dropdown_item);

[Woodard2589]

Thanks! It works now

[SixStringTheory]

Great!

Don't forge to check the Google Docs they have some good code examples.

Spinner | Android Developers

[Woodard2589]

another question. been trying to figure out how to figure out what the user selected. tried

adapter.getPosition(hubSpinner)

but it always returns -1. a few of the methods i tried returned long numbers that were different depending on the selection, but i couldnt figure out what to do with it, and cant figure out what i used again. any help?

[SixStringTheory]

Use "parent.getItemAtPosition(pos).toString()" in your onItemSelectedListener class. So it should look something like this. "tv" is a new TextView I made.

	public class MyOnItemSelectedListener implements OnItemSelectedListener {

	    public void onItemSelected(AdapterView<?> parent,
	        View view, int pos, long id) {
	      tv.setText(parent.getItemAtPosition(pos).toString());
	    }

	    @SuppressWarnings("unchecked")
		public void onNothingSelected(AdapterView parent) {
	      // Do nothing.
	    }
	}